Contents

module Vedeu

  # Change coordinates into an escape sequence to set the cursor position.
  #
  # @api private
  class Position

    attr_reader  :y,
      :x

    alias_method :first, :y
    alias_method :last, :x

    # Initializes a new instance of Position.
    #
    # @param y [Fixnum]
    # @param x [Fixnum]
    # @return [Position]
    def initialize(y = 1, x = 1)
      @y = y
      @x = x
    end

    # Returns an escape sequence to position the cursor. When passed a block,
    # will position the cursor, yield and return the original position.
    #
    # @param block [Proc]
    # @return [String]
    def to_s(&block)
      if block_given?
        [ sequence, yield, sequence ].join

      else
        sequence

      end
    end

    private

    # Returns the escape sequence to reposition the cursors at the coordinates
    # specified by x and y.
    #
    # @return [String]
    def sequence
      ["\e[", y, ';', x, 'H'].join
    end

    # Returns the y coordinate.
    #
    # @return [Fixnum]
    def y
      if @y < 1 || @y.nil?
        1

      else
        @y

      end
    end

    # Returns the x coordinate.
    #
    # @return [Fixnum]
    def x
      if @x < 1 || @x.nil?
        1

      else
        @x

      end
    end

  end # Position

end # Vedeu

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
vedeu-0.3.3	lib/vedeu/support/position.rb
vedeu-0.3.2	lib/vedeu/support/position.rb
vedeu-0.3.1	lib/vedeu/support/position.rb
vedeu-0.3.0	lib/vedeu/support/position.rb